18QHTF21-8.640-OE

Overview

The 18QHTF21-8.640-OE is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 8.64 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. A key functional characteristic is the inclusion of an enable/disable control pin, allowing for power management in active circuits. The component is housed in a compact 4-SMD, No Lead package with physical dimensions of 2.0mm by 1.6mm. This specific model represents a surface-mount solution suitable for space-constrained electronic designs requiring precise timing signals.

Feature Summary

• Features LVCMOS output logic for digital interface compatibility
• Includes enable/disable functionality for power optimization
• Utilizes a compact 4-SMD no-lead surface mount package

Applications

• General purpose timing reference in embedded systems
• Clock source for microcontrollers operating at 1.8V
• Digital signal processing circuitry requiring stable frequency input

Procurement Notes

Verify that the target design supports 1.8V logic levels before integration. Confirm that the PCB footprint matches the 2.0x1.6mm 4-SMD no-lead package specifications. Ensure the application requires the enable/disable pin functionality, as this may impact board layout and control logic. Cross-reference the manufacturer's latest datasheet for thermal and electrical limits to guarantee reliable operation within the intended environment.

Selection Notes

Select this component when a low-voltage 1.8V clock source is required for space-limited designs. The LVCMOS output ensures compatibility with standard digital logic families. Consider the enable/disable feature if power conservation is a priority. Compare against other Mercury oscillators in the QHTF series for alternative frequencies or package sizes if the 8.64 MHz specification does not meet system requirements.

Part Context

This part belongs to the Mercury Electronics XO (Crystal Oscillator) family, which provides standard timing solutions. The manufacturer specializes in quartz crystals and oscillators, offering various frequency control products. The 18QHTF21 series denotes a specific line of surface-mount oscillators characterized by low voltage operation and small form factors, catering to modern portable and high-density electronics.

Replacement Considerations

Direct substitutes include other 8.64 MHz LVCMOS oscillators from Mercury Electronics with identical 1.8V operation and 4-SMD packages, such as variants within the same QHTF series. Verify pinout compatibility and enable/disable functionality when replacing with components from different manufacturers.